[Help]Question about graphics architecture for weson/wayland

[Carsten Haitzler (The Rasterman)]

On Tue, 19 Aug 2014 02:20:58 +0000 Yang Andy <williamyang13 at hotmail.com> said:

> Hi Carsten
> 
> Thank you very much for your reply.
> 
> > EFL itself doesn't care what the compositor uses for acceleration. efl
> > supports either software rendering using shm protocol with wayland that
> > SHOULD work everywhere on all wayland compositors regardless of any driver
> > infra, types, acceleration etc. - there is also egl + gles2 rendering
> > support for acelerated rendering. of course compositor will then need to
> > handle drm buffers etc. to make this work.
> 
> If i choose software rendering using shm protocol,dose weston(compositor)
> use fbdev-backed?

what clients use is not relevant to what weston or the compositor might use.
shm is a universal "works everywhere" buffer exchange protocol for clients to
server. thus this works regardless what weston or any other compositor might
use to display. or should.

> My senario is that my target device do not support hardware accelerate.(do
> not use gpu) But i have to use EFL to develop application in wayland/weston
> platform.
> 
> In order to achieve my task,how do i setup weston?

i can't tell you how to set up weston, but clients are a separate matter and
shm should work just fine.

> Best regards.
> 
> Andy
> > Date: Mon, 18 Aug 2014 15:02:47 +0900
> > From: raster at rasterman.com
> > To: williamyang13 at hotmail.com
> > CC: ppaalanen at gmail.com; wayland-devel at lists.freedesktop.org
> > Subject: Re: [Help]Question about graphics architecture for weson/wayland
> > 
> > On Mon, 18 Aug 2014 05:32:41 +0000 Yang Andy <williamyang13 at hotmail.com>
> > said:
> > 
> > > Hi Pekka
> > > 
> > > Thank you very much for your reply.
> > > 
> > > > > 3.In order to run weston-launch,do i have to use gpu?
> > > > No, you can choose e.g. the fbdev backend for Weston, and so Weston
> > > > will run on the /dev/fb, software rendered. No GPU used there in that
> > > > sense. Software rendering also means that no application under Weston
> > > > can use the GPU for rendering windows.
> > > 
> > > If i choose fbdev backend for weston,can i use EFL/Evas and EGL/OpenGL for
> > > draw graphics? I mean that EGL/OpenGL which implement Software rendering.
> > > 
> > > What the difference between
> > > drm-backend/fbdbin/eolian/impl_generator.c:ev-backend/wayland-backend/x11-backend?
> > 
> > EFL itself doesn't care what the compositor uses for acceleration. efl
> > supports either software rendering using shm protocol with wayland that
> > SHOULD work everywhere on all wayland compositors regardless of any driver
> > infra, types, acceleration etc. - there is also egl + gles2 rendering
> > support for acelerated rendering. of course compositor will then need to
> > handle drm buffers etc. to make this work.
> > 
> > > Best regards.
> > > 
> > > Andy
> > > > Date: Thu, 14 Aug 2014 16:57:26 +0300
> > > > From: ppaalanen at gmail.com
> > > > To: williamyang13 at hotmail.com
> > > > CC: wayland-devel at lists.freedesktop.org
> > > > Subject: Re: [Help]Question about graphics architecture for
> > > > weson/wayland
> > > > 
> > > > On Thu, 14 Aug 2014 08:36:43 +0000
> > > > Yang Andy <williamyang13 at hotmail.com> wrote:
> > > > 
> > > > > Hi everyone
> > > > > 
> > > > > When i run 3D application through weston-launch, it failed because the
> > > > > graphics driver is not right.
> > > > 
> > > > weston-launch starts weston, you cannot use it to launch something else.
> > > > 
> > > > > I have some questions for help.
> > > > > 
> > > > > 1.Is there any requirement for Hardware(GPU??) / Drivers?
> > > > 
> > > > Yes, see hardware enabling at
> > > > http://wayland.freedesktop.org/architecture.html
> > > > 
> > > > > 2.Is DRM  must for weston(compositor),how to setup DRM?
> > > > 
> > > > Weston's DRM backend depends on DRM. Make sure your kernel has a DRM
> > > > driver for your graphics chip.
> > > > 
> > > > > 3.In order to run weston-launch,do i have to use gpu?
> > > > 
> > > > No, you can choose e.g. the fbdev backend for Weston, and so Weston
> > > > will run on the /dev/fb, software rendered. No GPU used there in that
> > > > sense. Software rendering also means that no application under Weston
> > > > can use the GPU for rendering windows.
> > > > 
> > > > You can also choose Weston's DRM backend with the software (Pixman)
> > > > renderer. That will not use the GPU either, but does need DRM and KMS.
> > > > 
> > > > > 4.Does GPU kernel drvier consist of kernel/driver/gpu/xxxx(xxxx.ko??)
> > > > > and of kernel/driver/gpu/drm/xxxx(DRM_xxxx.ko)?
> > > > 
> > > > Roughly yes.
> > > > 
> > > > > 5.Does user side drvier consist of EGL/OpenGLES?
> > > > 
> > > > The user space side of the driver usually implements EGL and OpenGL
> > > > (desktop/ES/whatever).
> > > > 
> > > > > 6.graphics architecture is
> > > > > Application⇒EGL/OpenGLES/⇒libDRM⇒DRM_xxxx.ko⇒xxxx.ko⇒GPU?
> > > > 
> > > > Yes, where EGL/OpenGLES is actually Mesa, since you have libdrm there.
> > > > This is specific to the open source drivers.
> > > > 
> > > > 
> > > > Thanks,
> > > > pq
> > >  		 	   		  
> > 
> > -- 
> > ------------- Codito, ergo sum - "I code, therefore I am" --------------
> > The Rasterman (Carsten Haitzler)    raster at rasterman.com
> > 
>  		 	   		  

-- 
------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler)    raster at rasterman.com